LIFE : OUTLINES OF GENERAL BIOLOGY 



PAGIi 



Fig. 147. Volvox with sperm-producing cells 865 



Fig. 148. Volvox with egg-cells 865 



Fig. 149. • Volvox with daughter-colonies v 865 



Fig. 150. Parts of a Flower 876 



Fig. 151. One of the extinct primitive insects. After Tillyard 877 



Fig. 152. Structure of a Feather 880 



Fig. 153. The Bittern 884 



Fig. 154. Antlers of Extinct Irish Deer 893 



Fig. 155. Vestigial Hip Girdle and Hind Limb of a Whale. After 



Struthers 90® 



Fig. 156. Part of a Genealogical Tree. After Doderlein 918 



Fig. 157. Part of a Genealogical Tree. After Heider 919 



Fig. 158. Survey of Invertebrate Animals 936 



Fig. 159. Survey of Vertebrate Animals 938 



Fig. 160. Liliaceous types, Tritoma, Galtonia, Lilium 944 



Fig. 161. Contrasted Gladiolus types 945 



Fig. 162. Effects of Shortening or Elongating the Axis 949 



Fig. 163. Variations in Hart's Tongue Fern. After Lowe 952 



Fig. 164. Foetal Membranes of a Mammal. After Turner 969 



Fig. 165. Structure of Robber-crab, After Semper 970 



Fig. 166. Position of Genes on a Chromosome. After Morgan 979 



Fig. 167, Schema of Genes on Chromosomes. After Morgan 980 



Fig. 168. Crossing over of Chromosomes. After Morgan 980 



Fig. 169. Eyes of the same kind of Crustacean in different conditions 



of illumination. After Doflein 984 



Fig. 170. Size-differences in leaves of the same plant. After De 



Vries 1008 



Fig. 171. Galton's Apparatus to show curve of frequency. After 



Galton 1009 



Fig. 172. Curve of Frequency. After Pearl 1009 



Fig. 173. Combs of Fowl, as affected by hormone stimulation loii 



Fig. 174. Types of Physogastry. After Wheeler 1012 



Fig. 175, Physogastric Guest from an Ant-hill. After Wheeler 1012 



Fig. 176. Mendelian Inheritance illustrated by combs of poultry 10 15 



Fig. 177. Two Mutants of Evening Primrose. After De Vries 1018 



Fig. 178. Simple Variation in Shape of Geranium Leaf 1020 



Fig. 179. The Foula Mouse, a new sub-species 1036 



Fig. 180. Two Varieties of the Potato-beetle. After Tower 1049 



Fig. 181. Regeneration in Starfish 1061 



Fig. 182. Winter-egg or Statoblast of Cristatella 1063 



Fig. 183. Internal Structure of Thigh-bone. After Hesse 1064 



